Zero-Downtime AWS Cloud Migration for Payment Gateway

The Challenge

The client operated a high-volume payment routing engine handling over ₹500 Crores in daily transactions. Their legacy physical data center suffered 3 major outages in 12 months, struggled to pass PCI-DSS v4.0 audits, and could not scale rapidly during flash sales.

Flexsys Technologies Solution & Approach

Flexsys Technologies executed a phased lift-and-shift + re-architecture strategy to AWS. We deployed multi-AZ Amazon RDS PostgreSQL with automated failover, auto-scaling EC2 instance groups behind Application Load Balancers, AWS WAF & Shield for DDoS protection, and automated CI/CD pipelines via AWS CodeDeploy.

Key Deliverables & Implementation

• AWS VPC architecture with private/public subnet isolation
• Multi-AZ RDS PostgreSQL cluster with automated 15-min backups
• Blue-green deployment pipeline via CodePipeline & Terraform
• CloudWatch dashboards with PagerDuty incident integration
• PCI-DSS v4.0 compliance documentation package